Beautiful simplicity. Surprisingly remarkable shot, given its relatively mundane subject matter. Great DOF, nice choice of processing (not overdone), love the minimalistic feel. Really great piece of work. I should have scored it higher. :-)
I really don't know if this is really working in b&w, or sepia toned kind of..
Since it seems it takes a lot of detail of the flower...
You could have used a smaller f-stop(higher number) to get more DOF.
Just my 2 cents.
I counted 70 flower shots (not counting the ones with bugs) in this challenge. This one I scored a little lower mostly because I would have rather seen this in color. There appears overexposed areas at the top of the clover, perhaps too much light.